The absolute value is the positive magnitude of a particular number or variable and is indicated by two vertical lines: \(\left|-5\right| = 5\). In the case of a variable absolute value (\(\left|a\right| = 5\)) the value of a can be either positive or negative (a = -5 or a = 5).
If \( \left|a - 1\right| \) + 3 = 0, which of these is a possible value for a?
| 4 | |
| 15 | |
| 1 | |
| -3 |